Hidden Bar - A ultra-light MacOS utility that helps hide menu bar icons.
WinDirStat - WinDirStat is a disk usage statistics viewer and cleanup tool, inspired by KDirStat.
Hocus Focus - A Mac menu bar utility that hides your inactive windows
WizTree - WizTree quickly finds the files and folders using the most space on your hard drive. It scans the MFT (Master File Table) instead of crawling the entire disk which makes it very fast.
Vanilla - Vanilla is a free Mac app that lets you hide icons from your menu bar.
TreeSize - TreeSize tells you where precious disk space has gone to.